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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88adb8b46ebfd36e8122d9bb64e3c03d55bad0b754b322479c6394cd50e11ebf' 
  AND token = 'j3kE/z4uv/aPphBxEUkcvx/JUrhpEoGUmW8pleF2Vns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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