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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cb02a749c058febe3ac3df797548b32cab4828321c373edfac9e3ccb59deb2' 
  AND token = 'ERIR9LnsfvF2U7QbiC3IkqW+icS5xbzzOT9oq3dMH1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}