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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e50f0fb6eda1feceaf382043e3e2cb5756b0ed8070dd495fc9b2ecc9530b2c4' 
  AND token = 'qMiSGN8c6RSLrIgbpNWn+P3mZUP1HBesoPj+w77juQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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