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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1c7d2dcbe60d92889a01090323caf063b4bf1cedc82b30ee8fc36060af2a56' 
  AND token = 'rOG/qaw6kQc67kFKkutySnPWIo2q0ftqY52EavNzlG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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