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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeec055eae2a8ba5a04b095b1514aecaf0df3e5a9cc1c65a8bc9da503b7265c' 
  AND token = 'UeqSE1/RYD4Nm7o4hvWgrrNUoE4PZP6ctA+1AIATlXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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