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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591a3c0dedce33d43f7028a9ff7dabcc70eb8110712734325631c351a18eff52' 
  AND token = 'KlaQ2nRI2gEOrmGd+s0t+VCput+6Yqyd1ySz8g2dEl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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