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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2762709ed6f8691fd08aea0bc63c563e0faec438570509345ee637596dd0ba3' 
  AND token = 'uDa4CBkkh/I1qVAynatxjXxgYyfJuFUvxGVcjoD8xUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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