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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90bb96d71e33c1626a63c33537926af7b7713d25e37073f503c529f06c63c0b' 
  AND token = 'Atp7tadFoSibsLT6B65dW2np72gj1SKaKLJfZaK8atk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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