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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2cfb1354a8eb69ef83e390292e17e060d8e3d1bfaf30639618fc5cceb59eb7' 
  AND token = '/Er2PFfwwfbrn5h0VkG8qjx8V0igvSFkZ+nWR4AWd0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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