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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0050765670e6a0f72f2f1eeba8aa210a0ca92b26e543d39abb1135c349e19a' 
  AND token = 'mEIVAaM4NHwJr2wW0WiQVl5VvmIooe2XPNekIRta6HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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