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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120740b06a8f1f5022be8c399faf6b89b42d6467099f76685a6cef71a8343fbe' 
  AND token = 'n3lbw89Jq8PwdG/lphGrqU0xCTuqtEGXSbJ8FkvgxNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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