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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71eeec0d8d5efdfe67bbb236fcd6b0f97eaccc5a8cc5372201a01385eef3d2e5' 
  AND token = 'KcpwhElDroZr5dxcRI4cCdP3ZA33O3BfjIDXNzjD150=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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