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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb4b77506134159ba19f7d69ee8691a0e79a99ddc3af51916b641f6f424d30b' 
  AND token = 'EUMLhgMLU/SAqSeCSQn/wu9GaJaKMHL0Pz/3iJa3hlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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