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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33035b41988de8f6eedbcf1ab82b7a5ceaae0b5b965f2c14b37e43b2241f4e05' 
  AND token = '1g65IN/LCevYir4G7LeYdnTOFZ6wJso7I0vdcV4ulGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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