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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0aa3a3b0519f163ae6c907606a85652f85b945ad6dfd4607810d96c62746358' 
  AND token = 'PGxUQRzs8mJ2QzWLbBWoxLmALcFqEq5t9F3lwAocejM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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