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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ac6162f7f2a3c6cae294e8405f196f0362922695953a77d9cbf558c60b7e6e' 
  AND token = '83q0O5hBlBMsApZdeX1zoeo51ysEZAfQoV+/Q1fjZlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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