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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090aa5e6fec209f14c5c07c1061e712d2fa5ee233607d814b74f83b6e0eb1e52' 
  AND token = '2YknVISPpD0NtqSNLzJbwLIE3aSfHlLMN8hONu1uVD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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