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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8285563a568ba22183930e34722849ade85e8693ecbc5c1496b1ce91fac758a0' 
  AND token = 'iHozUwN0RT4z/xDLPAEcy7wwiHsZBJlDCraGwDVF5NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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