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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4893d4557b5df77ad57751d1d26242945e74d21c82bc637aae73c8c4534bf2a' 
  AND token = 'oLfGIxEOtNIWb8WhxA6c8ha3tyq3tzeQLDjgpISQqzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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