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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcb7e162f92a73126ad40975e3ba58df0ba4d146ce4ac5cd7fb9e2f86b674fc' 
  AND token = 'ucFGxa17lJCsVPfp8nnmDlDfI4T4fxBv//QZVeYB5B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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