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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ff697bf61aca8700e571dd7771cd9f950c7f74fff3c4b929d2550c1aba5e42' 
  AND token = '2z4gTQtkspnR0luFiLwaIROetzXVLxbMK6Id2XJWav4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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