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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbc850f7037532e01f38d53916eae99d1d2efc273d61b5dc06db9725f3d2dfe' 
  AND token = 'A4tSrKXTIY7ph1B5CC3poBG1DQ1jO14ULeRK8ff5pPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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