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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809d3724303e98fc667820a1318f205d7141552e303ae4fe898b97156a2c5801' 
  AND token = 'QOLV3dB6suwG21zbM750LewjcoZ3ek+QRQE8rsqXqR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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