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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abdb32e854735b7b0ba4285b8d2e522cc6a47a83b6c1635d02c162f13898774' 
  AND token = 'tCfvxtkyqym+Bm114n+fA4LEN3GYXL/xPifEBXP5WdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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