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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fd849beb543ef170d91b12e3ca9c55e4ca4373e982e24f853835ee06617a00' 
  AND token = 'ZcaGELLtmFRPhQk+FUVRAnoRMeczZsdSb7qOppwYMUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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