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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8f06f34c03aa3bd4589291f0acd6a871f5be574efa414974cf53ab97f84193' 
  AND token = '3j1VOh+9kJajbdrYvOu2R9agapXX4IeIgOk22++NcGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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