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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2ef5a44534fb3671a0f0b1a38c9d8a59e3f069a8ea513bede62888f1e04239' 
  AND token = 'kvFC5rIgjX5dr/0U1YHOiebeOsN9kyOq2NETIPw80To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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