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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b169b32861dfa44d32afd544cb1b33ec569e77d67ffa5991b823f1d3fc5b19' 
  AND token = '6XgqClqXbLSPGow/qde8fnb+uNISvty6rjiiqkvaNv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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