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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a91bf0e5087e92e9e00c5a874bee1afa4facd4edcaa60a2ed91386ab8526bef' 
  AND token = 'qc/Ge5maKa4Wol68fwmofFNkipuk/OnGdNi5J5vXIwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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