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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0709f5b0090f44507019e20ae0de4ce2502d274c5352ac536762a27890f770ab' 
  AND token = 'r4NVHBNgqbQHcLBDUtySJNBeY+lYqDPt6cL9m2EHqw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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