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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e432be77bcf4cfb84b9c8da8bbca423345658fd146b0ac564381101fd96520c' 
  AND token = 'sgsGz0gQ2XvG80TdLUFnF/eHH4kjCxQ/W5qpeSSBrzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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