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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21634352d3590d8c963c83f1c945c6fb348f8ec05043a9689174792ce69e8b68' 
  AND token = 'G7lfcIsDlQWIbYhICZJWDFgSg3SaIwouo5sX612a6pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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