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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9c672a3ad9f6cdbe05524d0516c55e6ebab6dfe8216166bb6e6dd0dd2a6560' 
  AND token = 'g57mmi2hZngZmSQa0gx1c7Lh3BEezuIc/aNyf1rBrqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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