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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8ebe478d7044535cdbb94974d17c7112ac4fad5afcb2bc37c7cd88c12d2b90' 
  AND token = 'ha+yZu1fWRgOObB0apy+7NvTDH1unZ399gdYCgOUaws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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