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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1ab89a50c1173f0380439f1e84320d18a0ca1bc8fffce963d3a4b4c0828fe5' 
  AND token = 'E4//8urmBicFEjv/U6sDLd+JN5Pi8o1YXa4VR6M3xWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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