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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e19dda4e777adecc5fb21fc9f4d3a85104e7648eff1faecb48c094d83f05e9' 
  AND token = 'xdiKGVxSOXGYBcNh2VbpWX+xHSAzUN2U2Iy0UiEmx38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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