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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5108d733e0c31134ad96939dc005464e58377d86ed28a65f33a69bab72efdf4e' 
  AND token = 'VTaW9YCpcEByfYdR1G4GsM3SWH1mUp2015mEjflmI5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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