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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552411cafd62dafa4ec481b0db9587300ca7f1dd7beac71840a14db534320f0b' 
  AND token = '0MWpP40Rt6NSR3gc0+bgi3wUN4GDUDIOeBZFissY164=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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