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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e95f1b05adfd732ab7ab5b1823cffe357b8f30e6400b0ac5b802c2754f28fbe' 
  AND token = 'OAeO03p3VexMulY2/3nFYs82zAD5lnhj1qPU6IbWTsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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