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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0785b4004b98e2cd45598a3cfe1116592c6a49f71b520e3171a8808f5c979233' 
  AND token = 'v0eVqMzc3fCPFhw6AaNpeNVMHjf9kESnULiaLgg0r2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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