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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd42a44e1ba78a2e61cfa02d5ee06c113a1bfa2733608af0608682b6ce4d5b73' 
  AND token = 'oszSRmeR6+Z0wjBFKrpCz89lV4e8e02ZRE0xkJdIJeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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