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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43eda2b90c63895eb9498cb9860383dfc32a23ef06a79aa834b4c59641f1d4c4' 
  AND token = 'n7d6hF607rBgyhhoHKW3j23jME6IWur6S+NePzJVcEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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