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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db45001d901bef33219c65c52fe789b34183f4dbfaa8cf3e4ef1bf66b83df474' 
  AND token = 'Vn2NtFWxqwNwfK8g+l+M3KV5w+/Tw0Gs/0S4vBEtExw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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