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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372cc5cf03f7ba7ba821d3c18de277d7ac58cc87ba5f6a51486572b6680ea3d4' 
  AND token = 'Pa+KLozrSHCAfCcl/WDWQIsal4cfJQuy111NnjwDD/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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