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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a3f7a5c82052e689e3fab81c7b4488d1b29dbaf359ef5bff9248f52d0f92c6' 
  AND token = 'Nc8GhkR1E2eXekdJrFUusgcTac9mLltVPD/rkV3wsas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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